git.m6w6.name Git - m6w6/ext-psi/blob - src/libffi.c

   1 #include "php.h"
   2 #include "php_psi.h"
   3 #include "libffi.h"
   4
   5 #undef PACKAGE
   6 #undef PACKAGE_BUGREPORT
   7 #undef PACKAGE_NAME
   8 #undef PACKAGE_STRING
   9 #undef PACKAGE_TARNAME
  10 #undef PACKAGE_VERSION
  11
  12 #include <ffi.h>
  13
  14 #ifndef PSI_HAVE_FFI_CLOSURE_ALLOC
  15 # if HAVE_UNISTD_H
  16 #  include <unistd.h>
  17 # endif
  18 # if HAVE_SYS_MMAN_H
  19 #  include <sys/mman.h>
  20 #  ifndef MAP_ANONYMOUS
  21 #   define MAP_ANONYMOUS MAP_ANON
  22 #  endif
  23 # endif
  24 #endif
  25
  26 static void *psi_ffi_closure_alloc(size_t s, void **code)
  27 {
  28 #ifdef PSI_HAVE_FFI_CLOSURE_ALLOC
  29         return ffi_closure_alloc(s, code);
  30 #elif HAVE_MMAP
  31         *code = mmap(NULL, s, PROT_EXEC|PROT_WRITE|PROT_READ,
  32                         MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
  33         if (MAP_FAILED == *code) {
  34                 return NULL;
  35         }
  36         return *code;
  37 #else
  38         return NULL;
  39 #endif
  40 }
  41
  42 static void psi_ffi_closure_free(void *c)
  43 {
  44 #ifdef PSI_HAVE_FFI_CLOSURE_ALLOC
  45         ffi_closure_free(c);
  46 #elif HAVE_MMAP
  47         munmap(c, sizeof(ffi_closure));
  48 #endif
  49 }
  50
  51 static void psi_ffi_handler(ffi_cif *signature, void *_result, void **_args, void *_data);
  52
  53 static inline ffi_abi psi_ffi_abi(const char *convention) {
  54         return FFI_DEFAULT_ABI;
  55 }
  56 static inline ffi_type *psi_ffi_type(token_t t) {
  57         switch (t) {
  58         default:
  59                 ZEND_ASSERT(0);
  60                 /* no break */
  61         case PSI_T_VOID:
  62                 return &ffi_type_void;
  63         case PSI_T_INT8:
  64                 return &ffi_type_sint8;
  65         case PSI_T_UINT8:
  66                 return &ffi_type_uint8;
  67         case PSI_T_INT16:
  68                 return &ffi_type_sint16;
  69         case PSI_T_UINT16:
  70                 return &ffi_type_uint16;
  71         case PSI_T_INT32:
  72                 return &ffi_type_sint32;
  73         case PSI_T_UINT32:
  74                 return &ffi_type_uint32;
  75         case PSI_T_INT64:
  76                 return &ffi_type_sint64;
  77         case PSI_T_UINT64:
  78                 return &ffi_type_uint64;
  79         case PSI_T_BOOL:
  80                 return &ffi_type_uchar;
  81         case PSI_T_INT:
  82                 return &ffi_type_sint;
  83         case PSI_T_FLOAT:
  84                 return &ffi_type_float;
  85         case PSI_T_DOUBLE:
  86                 return &ffi_type_double;
  87         }
  88 }
  89 static inline ffi_type *psi_ffi_decl_type(decl_type *type) {
  90         return psi_ffi_type(real_decl_type(type)->type);
  91 }
  92 static inline ffi_type *psi_ffi_decl_arg_type(decl_arg *darg) {
  93         if (darg->var->pointer_level) {
  94                 return &ffi_type_pointer;
  95         } else {
  96                 return psi_ffi_decl_type(darg->type);
  97         }
  98 }
  99
 100 typedef struct PSI_LibffiContext {
 101         ffi_cif signature;
 102         ffi_type *params[2];
 103         struct {
 104                 struct PSI_LibffiData **list;
 105                 size_t count;
 106         } data;
 107 } PSI_LibffiContext;
 108
 109 typedef struct PSI_LibffiData {
 110         PSI_LibffiContext *context;
 111         impl *impl;
 112         zend_internal_arg_info *arginfo;
 113         void *code;
 114         ffi_closure *closure;
 115         ffi_cif signature;
 116         ffi_type *params[1];
 117 } PSI_LibffiData;
 118
 119 static inline PSI_LibffiData *PSI_LibffiDataAlloc(PSI_LibffiContext *context, impl *impl) {
 120         ffi_status rc;
 121         size_t i, c = impl->decl->args ? impl->decl->args->count : 0;
 122         PSI_LibffiData *data = malloc(sizeof(*data) + c * sizeof(ffi_type *));
 123
 124         data->context = context;
 125         data->impl = impl;
 126         data->arginfo = psi_internal_arginfo(impl);
 127         for (i = 0; i < c; ++i) {
 128                 data->params[i] = psi_ffi_decl_arg_type(impl->decl->args->args[i]);
 129         }
 130         data->params[c] = NULL;
 131
 132         rc = ffi_prep_cif(
 133                         &data->signature,
 134                         psi_ffi_abi(data->impl->decl->abi->convention),
 135                         c,
 136                         psi_ffi_decl_arg_type(data->impl->decl->func),
 137                         data->params);
 138         ZEND_ASSERT(FFI_OK == rc);
 139
 140         data->closure = psi_ffi_closure_alloc(sizeof(ffi_closure), &data->code);
 141         ZEND_ASSERT(data->closure != NULL);
 142 #if PSI_HAVE_FFI_PREP_CLOSURE_LOC
 143         rc = ffi_prep_closure_loc(
 144                         data->closure,
 145                         &context->signature,
 146                         psi_ffi_handler,
 147                         data,
 148                         data->code);
 149         ZEND_ASSERT(FFI_OK == rc);
 150 #elif PSI_HAVE_FFI_PREP_CLOSURE
 151         rc = ffi_prep_closure(data->code, &context->signature, psi_ffi_handler, data);
 152         ZEND_ASSERT(FFI_OK == rc);
 153 #else
 154 # error "Neither ffi_prep_closure() nor ffi_prep_closure_loc() available"
 155 #endif
 156
 157         context->data.list = realloc(context->data.list, ++context->data.count * sizeof(*context->data.list));
 158         context->data.list[context->data.count-1] = data;
 159
 160         return data;
 161 }
 162
 163 static inline void PSI_LibffiDataFree(PSI_LibffiData *data) {
 164         psi_ffi_closure_free(data->closure);
 165         free(data->arginfo);
 166         free(data);
 167 }
 168
 169 static inline PSI_LibffiContext *PSI_LibffiContextInit(PSI_LibffiContext *L) {
 170         ffi_status rc;
 171
 172         if (!L) {
 173                 L = malloc(sizeof(*L));
 174         }
 175         memset(L, 0, sizeof(*L));
 176
 177         L->params[0] = &ffi_type_pointer;
 178         L->params[1] = &ffi_type_pointer;
 179         rc = ffi_prep_cif(&L->signature, FFI_DEFAULT_ABI, 2, &ffi_type_void, L->params);
 180         ZEND_ASSERT(rc == FFI_OK);
 181
 182         return L;
 183 }
 184
 185 static inline void PSI_LibffiContextDtor(PSI_LibffiContext *L) {
 186         size_t i;
 187
 188         for (i = 0; i < L->data.count; ++i) {
 189                 PSI_LibffiDataFree(L->data.list[i]);
 190         }
 191         if (L->data.list) {
 192                 free(L->data.list);
 193         }
 194 }
 195
 196 static inline void PSI_LibffiContextFree(PSI_LibffiContext **L) {
 197         if (*L) {
 198                 PSI_LibffiContextDtor(*L);
 199                 free(*L);
 200                 *L = NULL;
 201         }
 202 }
 203
 204 static void psi_ffi_handler(ffi_cif *_sig, void *_result, void **_args, void *_data)
 205 {
 206         PSI_LibffiData *data = _data;
 207         size_t i;
 208         void **arg_prm = NULL;
 209         impl_val ret_val;
 210
 211         if (SUCCESS != psi_parse_args(*(zend_execute_data **)_args[0], data->impl)) {
 212                 return;
 213         }
 214
 215         if (data->impl->decl->args) {
 216                 arg_prm = malloc(data->impl->decl->args->count * sizeof(*arg_prm));
 217
 218                 for (i = 0; i < data->impl->decl->args->count; ++i) {
 219                         decl_arg *darg = data->impl->decl->args->args[i];
 220
 221                         arg_prm[i] = psi_do_let(darg);
 222                 }
 223         }
 224
 225         ffi_call(&data->signature, FFI_FN(data->impl->decl->dlptr), &ret_val, arg_prm);
 226
 227         psi_do_return(data->impl, &ret_val, *(zval **)_args[1]);
 228
 229         for (i = 0; i < data->impl->stmts->set.count; ++i) {
 230                 set_stmt *set = data->impl->stmts->set.list[i];
 231
 232                 if (set->arg->_zv) {
 233                         psi_do_set(set->arg->_zv, set->val->func, set->val->vars);
 234                 }
 235         }
 236
 237         for (i = 0; i < data->impl->stmts->fre.count; ++i) {
 238                 free_stmt *fre = data->impl->stmts->fre.list[i];
 239
 240                 psi_do_free(fre);
 241         }
 242
 243         psi_do_clean(data->impl);
 244
 245         if (arg_prm) {
 246                 free(arg_prm);
 247         }
 248 }
 249
 250 static void psi_ffi_init(PSI_Context *C)
 251 {
 252         C->context = PSI_LibffiContextInit(NULL);
 253 }
 254
 255 static void psi_ffi_dtor(PSI_Context *C)
 256 {
 257         PSI_LibffiContextFree((void *) &C->context);
 258 }
 259
 260 static zend_function_entry *psi_ffi_compile(PSI_Context *C, PSI_Data *D)
 261 {
 262         size_t i, j = 0;
 263         zend_function_entry *zfe = calloc(D->impls->count + 1, sizeof(*zfe));
 264         PSI_LibffiContext *ctx = C->context;
 265
 266         for (i = 0; i < D->impls->count; ++i) {
 267                 zend_function_entry *zf = &zfe[j];
 268                 PSI_LibffiData *data;
 269
 270                 if (!D->impls->list[i]->decl) {
 271                         continue;
 272                 }
 273
 274                 data = PSI_LibffiDataAlloc(ctx, D->impls->list[i]);
 275                 zf->fname = D->impls->list[i]->func->name + (D->impls->list[i]->func->name[0] == '\\');
 276                 zf->num_args = D->impls->list[i]->func->args->count;
 277                 zf->handler = data->code;
 278                 zf->arg_info = data->arginfo;
 279                 ++j;
 280         }
 281
 282         return zfe;
 283 }
 284
 285 static PSI_ContextOps ops = {
 286         psi_ffi_init,
 287         psi_ffi_dtor,
 288         psi_ffi_compile,
 289 };
 290
 291 PSI_ContextOps *PSI_Libffi(void)
 292 {
 293         return &ops;
 294 }